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168

Slot-Drilling Machine.

the larger drills; a second socket k within the first is for medium
drills : and a third, within k, fits the smaller sizes. These are
carefully ground to fine taper, and are quite rigid.

The  Slot-Drilling  Machine (now metamorphosed into
the vertical milling machine) has a saddle carrying the drill spindle

DX/LL  SPJNDLZ

as in Fig. 168, but arm B is made immovable. While rotating,
the. spin die also receives a traverse along slide B, taken from a
leading screw,, lying within B, in addition to the shaft L. The
•drill thus cuts out a circle that travels along a straight line, known
as a slot. Keyways and cotter holes are examples, and for such
work vertical and horizontal feeds are required. (See Appendix If,,
p. 810.)